I have noticed that recently, whenever I start Firefox, BING is auto-opening a new tab *without my input.* Firefox is not my default browser (I use several), and I have removed ALL extensions and themes (except for ad-blocking, which has always been there), and ensured that pop-up blocker is enabled. My Windows 10 PC cannot find any malware; I hate being hijacked (esp. by Microsoft) and want this to stop! My other browsers do not do this...only Firefox. I have tried suggestions to modify REGEDIT, but can find no solutions to prevent this (other than not using Firefox anymore). Help, please! Thanks so much.